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chromium/third_party/blink/web_tests/external/wpt/mathml/crashtests/mozilla/379418-1.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
ΧΆ</math>
</body>
</html>